fat / phat are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
fat: (noun) a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides). (adjective) having an (over)abundance of flesh. (adjective) having a relatively large diameter. (adjective) lucrative. (adjective) marked by great fruitfulness.
phat: NA
fat: f·AE·t
phat: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)